The specs for Scratch Live is stated at the bottom of this page:
serato.com
But you should know that you need to buy hardware (SL1, SL2, SL3, SL4, TTM57SL, Sixty-One, Sixty-Two och Sixty-Eight) in order for it to work :)
You would have to install it on all computers (don't need to download it on everyone if you have a USB-memory stick or something to transfer it to all the computers)
It's really easy to uninstall, takes just a minute or two :)
I have no clue about permissions though since I'm just a regular user :P